They sent an e-mail with a selection of days to chose from.
I got the email about 3 - 4 weeks after my secondary was mailed to them.
If you get interviewed there bring comfortable shoes - there is alot of walking. Also, bring warm clothes if your used to being in a warm climate.
They have only been interviewing for two weeks now so there is still alot of time left for them.
I wish I had known that they wait till Dec to review all the applications up till that point. It is not rolling admissions.